Reference: Articles, papers etc.

The number of species of insect associated with various trees

By T. R. E. Southwood

A very frequently quoted study which showed that species of tree which are native to Britain support vastly more species of insects than trees wich are not native - even though they may have been introduced many hundreds of years ago.

Citation

Southwood, T. R. E., 1961, The number of species of insect associated with various trees. Journal of Animal Ecology, 30, 1-8.